How to find sampling rate

it's the number of samples per unit time, i.e. 1/(interval between samples)

Oh i see, Thank you.
Is there any chance you could explain to me what Aliasing is?

You're probably interested in temporal aliasing but it also occurs in imaging.

There's a wikipedia page on aliasing
https://en.wikipedia.org/wiki/Aliasing

You probably can see the effect of a low sampling rate from one of the diagrams in that article...

https://en.wikipedia.org/wiki/Aliasing#/media/File:AliasingSines.svg

say the input signal is the red waveform - with an insufficient sampling rate it would be be impossible to tell from the output of the sampling that the input wasn't the blue signal - and an audio system would play back the blue note - which wasn't there in the input.